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By Authority Of 


Legally Binding Document 

By the Authority Vested By Part 5 of the United States Code § 552(a) and 
Part 1 of the Code of Regulations § 51 the attached document has been duly 
INCORPORATED BY REFERENCE and shall be considered legally 
binding upon all citizens and residents of the United States of America. 
HEED THIS NOTICE : Criminal penalties may apply for noncompliance. 

Document Name: SAE J386: Operator Restraint Systems for Off-Road 

Work Machines 

CFR Section(s): 

Standards Body: Society of Automotive Engineers 





SAE Recommended Practice 

Report of Construction and Industrial Machinery Technical Committee approved March 1969. 

1. Purpose— The purpose of this recommended practice is to estab- 
lish minimum requirements for a pelvic restraint belt suitable' for use 
primarily on track-type tractors, wheel tractor-scrapers, wheel loaders, 
motor graders, and similar types of construction equipment. 

2. Scope— This recommended practice covers the general require- 
ments for webbing, buckle hardware, adjustment hardware, and attach- 
ment hardware of the restraint system. It does not include the method 
or direction of attachment to the vehicle or seat assembly. 

3. Definitions 

3.1 Type 1 System— Lap belt only for pelvic restraint, 

3.2 Type 2 System— Combination of pelvic and upper torso re- 

3.3 Hardware— Any metal or rigid plastic part of the seat belt as- 

3.4 Polyester Fiber— Any long chain synthetic polymer composed 
of at least 85% by weight of an ester of a dihydric acid and tereph- 
thalic acid. 

3.5 Roping— The tendency of a piece of webbing to twist upon it- 
self and remain in the form of a rope instead of returning to its 
original strap, form. 

3.6 Model or Style Number— Identification of a seat belt assembly 
consisting of a single combination of webbing having a specific type 
of fiber, weave, and construction, and hardware having a specific 

4. General Requirements 

4.1 Single Occupancy— A seat belt shall be designed for use by one, 
and only one, person at any one time. 

4.2 Pelvic Restraint— A seat belt shall provide pelvic restraint 
whether or not upper torso restraint is provided. The seat belt shall 
also be designed to secure the pelvis and remain in the pelvic area 
under operating, collision, or roll-over conditions. 

4.3 Hardware— All hardware parts which contact, under normal 
usage, a person, clothing, or webbing shall be free from burrs and 
sharp edges. 

4.4 Release— The seat belt shall be provided with a buckle or 
buckles readily accessible to the occupant to permit his easy and rapid 
removal from the assembly. The buckle release mechanism shall be 
designed to minimize the possibility of accidental release. 

4.5 Adjustment— The seat belt shall be capable of snug adjustment 
by the occupant by a means easily within his reach, or shall be provided 
with an automatic locking or emergency locking retractor. The ad- 
justment range shall accommodate the 5th through the 95th percentile 
American male (SAE J833). 

4.6 Marking— Each seat belt shall be permanently and legibly . 
marked or labeled with year of manufacture, model or style number, 
and name or trade mark of manufacturer or distributor, or of the im- 
porter if manufactured outside of the United States. 

4.7 Usage and Maintenance Instructions— Seat belts shall be ac- 
companied by written instructions to the installer for the proper use 
of wearing the belt snugly and properly located on the body and for 
the maintenance of the belt, including periodic inspection of all com- 
ponents. The instructions shall show the proper manner of threading 
the webbing in the hardware of seat belts in which the webbing is not 
permanently fastened. 

4.8 Assembly Performance— The seat belt shall meet all the re- 
quirements for assembly performance listed in SAE J4c. 

5. Webbing Requirement's 

5.1 General— The webbing shall meet the applicable requirements 
of SAE J4c. 

5.2 Material— The webbing material shall have a resistance to 
acids, alkalies, mildew, aging, moisture, and sunlight equal to or bet- 
ter than that of untreated polyester fiber. 

5.3 Stiffness— To minimize "roping," the webbing shall be woven 
and/or treated to produce a stiffness in the transverse direction equal 
to or greater than that obtained with a weave of double plain with one 
up, one down binder without stuffers. This stiffness shall be effective 
for the usable life of the webbing. The webbing shall be flexible in 
the longitudinal direction to permit adjustment down to —40 F. 

5.4 Color— The color black is preferred since it is least affected by 
exposure to ultraviolet light. 

5.5 Width— The webbing shall be not less than 1.8 in. (46 mm) in. 
width when measured as specified in SAE J4c. 

5.6 Strength-The webbing shall have not less than 6000 lb (2720 
kg) breaking strength when tested by the procedures specified in SAE 

5.7 Elongation— The webbing shall not extend to more than 15% 
at 2500 lb (1130 kg) when subjected to the specified forces in accor- 
dance with the procedures specified in SAE J4c. 

5.8 Resistance to Abrasion— The webbing shall have a breaking 
strength not less than 75% of the strength before abrasion when 
tested in accordance with SAE J4c. 

5.9 Ends— The ends of the webbing shall be protected or treated 
to prevent unraveling, and shall not pull out of the adjustment hard- 
ware at the maximum size adjustment. 

6. Buckle Hardware Requirements 

6.1 General— The buckle hardware shall meet all of the applicable 
requirements of SAE J4c. 

6.2 Release— The buckle shall be designed so that it can be easily 
released with a single motion. It shall also be capable of being released 
with either available mittened hand. 

6.3 Closure— The buckle shall be designed so that it can be easily 
closed with mittened hands. 

6.4 Size— The buckles should be as wide as the webbing width and 
shall not present any rougher surface between the belt and the buckle . 
than a doubled back thickness of the webbing when the assembly is 
loaded in accordance with the standard loop test (see SAE J4c). 

6.5 Padding-=-If a buckle is used which is less than the width of 
the webbing, a pad must be provided. This pad must cover the entire 
buckle area and be the full width of the webbing. It must be made of 
a material having properties equal to or better than that stated in 
paragraph 5.2 and must be permanently fastened to the assembly so 
that it is not injurious or uncomfortable to the operator. 

7. Adjustment Hardware Requirements 

7.1 General— The adjustment hardware shall meet all the ap- 
plicable requirements of SAE J4c. 

7.2 Location— When a two-piece belt is used, the adjustment means 
shall be on each half of the belt to allow for the centering of the 
buckle on the operator. 

7.3 Operation— Each adjustment shall be capable of being made 
with the use of one mittened hand. 

5. Attachment Hardware Requirements— The attachment hardware 
shall meet all the applicable requirements of SAE J4c.